package holiday;

public class StringBuilderDemo {
    public static void main(String[] args) {
        String str="好好学习Java";
        StringBuilder builder =new StringBuilder(str);
        //append():追加内容
        builder.append(",为了找个好工作");
        System.out.println(builder);

        //replace():替换部分内容(含头不含尾)
        builder.replace(9,16,"就是为了改变世界");
        System.out.println(builder);

        //delete():删除部分内容(含头不含尾)
        builder.delete(0,8);//删除下标为0-7
        System.out.println(builder);

        //insert():插入内容
        builder.insert(0,"活着");
        System.out.println(builder);

        //reverse():反转
        builder.reverse();//反转builder内容
        System.out.println(builder);

    }
}
